Water-soluble ammonium polyphosphate NPK compound fertilizer and preparation method thereof

A water-soluble poly and ammonium phosphate technology, applied in the field of compound fertilizers, can solve the problems of serious ammonia loss of ammonium polyphosphate, fast decay of product polymerization rate, poor bubble control effect, etc., so as to improve the utilization rate of phosphate fertilizer and slow the decay of polymerization rate. , The effect of strong product stability

Inactive Publication Date: 2016-01-27
SHENZHEN BATIAN ECOTYPIC ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of water-soluble ammonium polyphosphate NPK compound fertilizer, aiming to solve the problem of seri

Method used

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  • Water-soluble ammonium polyphosphate NPK compound fertilizer and preparation method thereof

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preparation example Construction

[0025] And, the embodiment of the present invention provides a kind of preparation method of water-soluble ammonium polyphosphate NPK compound fertilizer, comprises the following steps:

[0026] S01. Provide urea and additives to form a low-melt mixture, and melt the low-melt mixture to obtain a first melt;

[0027] S02. Adding a blend formed by monoammonium phosphate, potassium sulfate or potassium chloride to the first melt, and performing a heating reaction;

[0028] S03. Granulation.

[0029] Specifically, in the above step S01, the melting point of the urea is lowered by adding the additive, thereby lowering the heating reaction temperature. On the one hand, make described heating reaction temperature to 110-150 ℃, reduce the polymerization degree of synthetic ammonium polyphosphate to 2-10, be soluble in water, can be used for producing compound fertilizer (conventional reaction is with urea, monoammonium phosphate as raw material, in At a temperature of 200-300°C, amm...

Embodiment 1

[0043] A kind of water-soluble ammonium polyphosphate NPK compound fertilizer, comprises monoammonium phosphate, potassium sulfate or potassium chloride, low melting mixture, wherein, described low melting mixture comprises urea and additive, and described additive is ammonium chloride, potassium chloride 1. At least one of dicyandiamide, the mass ratio of the urea, monoammonium phosphate, potassium sulfate or potassium chloride is 1.0:1.0:1.0, and the mass ratio of the additive to the urea is 0.1:1.

[0044] The preparation method of described water-soluble ammonium polyphosphate NPK compound fertilizer, comprises the following steps:

[0045] S11. Provide urea and additives to form a low-melt mixture, and melt the low-melt mixture to obtain a first melt;

[0046] S12. Adding a blend formed by monoammonium phosphate, potassium sulfate or potassium chloride to the first melt, and performing a heating reaction, wherein the temperature of the heating reaction is 110° C., and the...

Embodiment 2

[0049] A water-soluble ammonium polyphosphate NPK compound fertilizer, comprising monoammonium phosphate, potassium sulfate or potassium chloride, a low-melt mixture and auxiliary materials, wherein the low-melt mixture includes urea and additives, and the additives are ammonium chloride, chlorine Potassium chloride, dicyandiamide at least one, described auxiliary material is at least one in ammonium sulfate, zinc sulfate, magnesium sulfate, borax, and the mass ratio of described urea, monoammonium phosphate, potassium sulfate or potassium chloride is 7.0:1.0:2.0, the mass ratio of the additive to the urea is 0.3:1.

[0050] The preparation method of described water-soluble ammonium polyphosphate NPK compound fertilizer, comprises the following steps:

[0051] S21. Provide urea and additives to form a low-melt mixture, and melt the low-melt mixture to obtain a first melt;

[0052] S22. Add a blend formed by monoammonium phosphate, potassium sulfate or potassium chloride to th...

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Abstract

The invention relates to the field of compound fertilizers and provides a water-soluble ammonium polyphosphate NPK compound fertilizer and a preparation method thereof. The water-soluble ammonium polyphosphate NPK compound fertilizer comprises monoammonium phosphate, potassium sulphate or potassium chloride and a low-melting mixture, wherein the low-melting mixture comprises urea and an addition agent. The mass ratio of the urea to the monoammonium phosphate to the potassium sulphate or the potassium chloride is (1.0-7.0):1.0:(1.0-2.0). The preparation method of the water-soluble ammonium polyphosphate NPK compound fertilizer comprises the following steps that the urea and the addition agent are provided for forming the low-melting mixture, and melting treatment is performed on the low-melting mixture to obtain a first melt; a blend formed by the monoammonium phosphate and the potassium sulphate or the potassium chloride is added into the first melt to be subjected to a heating reaction; granulation is performed. The problems that when an existing method is adopted for synthesizing ammonium polyphosphate, the ammonia loss problem is serious, the environment is polluted, the bubble control effect is poor and the pH value is low, so that the product aggregation rate is rapid in attenuation are solved.

Description

technical field [0001] The invention belongs to the field of compound fertilizers, in particular to a water-soluble ammonium polyphosphate NPK compound fertilizer and a preparation method thereof. Background technique [0002] At present, the synthesis of ammonium polyphosphate by urea-ammonium phosphate method is carried out at high temperature or high pressure. The high-purity and high-polymerization-degree ammonium polyphosphate prepared by high-temperature and high-pressure reaction is due to its high degree of polymerization and high water insolubility. Features, mainly used in the field of flame retardants. Adopting urea-ammonium phosphate method to synthesize water-soluble ammonium polyphosphate compound fertilizer has the following difficulties: it is difficult to control the amount of bubbles in the reaction process, the biuret content of the obtained ammonium polyphosphate product exceeds the standard, and the polymerization rate of the obtained product decays quic...

Claims

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Application Information

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IPC IPC(8): C05G1/00
Inventor 戴毅平褚红艳张建军刘腾余春秋谷焕芝沈鹏鹏
Owner SHENZHEN BATIAN ECOTYPIC ENG
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